2维组合宽带隙光子晶体的研究

为了研究由两种不同的介质柱组合成的2维光子晶体的传输特性,对包层介质柱/基质光子晶体与空气柱/基质光子晶体组合的三角晶格光子晶体进行研究,采用时域有限差分法,对其进行模拟计算,得到多种情况下光子晶体的透射系数与入射光频率的关系曲线.结果表明,在这种组合结构的光子晶体中,可以得到从低频到高频的组合宽带隙,从而达到在更宽范围内控制电磁波传播的目的;包层介质柱外半径的变化对带隙的宽度影响较大;包层介质柱的内半径的大小、内柱和中间夹层的介电常数对带隙宽度没有影响,但是对带隙内的缺陷模有明显的影响.由此可以根据实际需要,通过调节此种光子晶体的结构参量制作极窄带通的滤波器和光开关等.

Research on composite wide band gap of 2-D Photonic Crystal

Using FDTD method, the characteristics of 2-D triangular lattice photonic crystal was investigated, a combined wide gap from low to high frequency can be achieved from the composite photonic crystal which constructed with layer medium rods/bottom medium and air rods/bottom medium, so the electromagnetic wave can be prohibited in a wide frequency range. In composed photonic crystal, the external radius of layer medium rods had a great influence to the width of band gap, while the internal radius，dielectric constant and middle dielectric constant of layer medium rods had a great influence to defect mode in the band gap, so The results are very meaningful on design of 2-D photonic crystal devices such as optics filter and switch